Selective deposition of silicon oxide on dielectric surfaces relative to metal surfaces

Abstract

Methods for selective deposition of silicon oxide films on dielectric surfaces relative to metal surfaces are provided. A metal surface of a substrate may be selectively passivated relative to the dielectric surface, such as with a polyimide layer or thiol SAM. Silicon oxide is selectively deposited on the dielectric surface relative to the passivated metal surface by contacting the dielectric surface with a metal catalyst and a silicon precursor comprising a silanol.

What is claimed is: 
     
       1. A method of selectively depositing silicon oxide on a dielectric surface of a substrate relative to a metal surface of the substrate, the method comprising, in order:
 selectively passivating the dielectric surface relative to the metal surface; 
 selectively forming a polymer passivation layer on the metal surface; 
 contacting the dielectric surface with a metal catalyst; and 
 contacting the dielectric surface with a silicon reactant comprising a silanol. 
 
     
     
       2. The method of  claim 1 , wherein the metal surface comprises one or more of Al, Cu, Co, Ni, W, Nb, Fe, and Mo. 
     
     
       3. The method of  claim 1 , wherein the dielectric surface comprises silicon oxide. 
     
     
       4. The method of  claim 1 , wherein selectively passivating the dielectric surface comprises contacting the dielectric surface with a silylating agent. 
     
     
       5. The method of  claim 4 , wherein the silylating agent comprises an alkylaminosilane. 
     
     
       6. The method of  claim 4 , wherein the silylating agent comprises allyltrimethylsilane (TMS-A), chlorotrimethylsilane (TMS-Cl), N-(trimethylsilyl)imidazole (TMS-Im), octadecyltrichlorosilane (ODTCS), hexamethyldisilazane (HMDS), or N-(trimethylsilyl)dimethylamine (TMSDMA). 
     
     
       7. The method of  claim 1 , additionally comprising treating the dielectric surface with plasma after selectively forming the polymer passivation layer on the metal surface and prior to contacting the dielectric surface with the metal catalyst. 
     
     
       8. The method of  claim 1 , wherein the metal catalyst comprises trimethyl aluminum (TMA), dimethylaluminumchloride, aluminum trichloride (AlCl 3 ), dimethylaluminum isopropoxide (DMAI), tri s(tert-butyl)aluminum (TTBA), tris(isopropoxide)aluminum (TIPA) or triethyl aluminum (TEA). 
     
     
       9. The method of  claim 1 , wherein the metal catalyst is a metal compound comprising Zn, Mg, Mn, La, Hf, Al, Zr, Ti, Sn, or Ga. 
     
     
       10. The method of  claim 1 , wherein the silicon reactant comprises tris(tert-butoxy)silanol (TBS), tris(isopropoxy)silanol (TIS), or tris(tert-pentoxy)silanol (TPS). 
     
     
       11. The method of  claim 1 , wherein the polymer passivation layer formed on the metal surface comprises a self-assembled monolayer (SAM) or a polyimide layer. 
     
     
       12. The method of  claim 1 , wherein the selectivity of deposition of silicon oxide on the catalyzed dielectric surface relative to the metal surface on which the polymer passivation layer has been formed is greater than about 50%. 
     
     
       13. A method of selectively depositing silicon oxide on a dielectric surface of a substrate relative to a metal surface of the substrate comprising:
 selectively forming a polymer passivation layer on the metal surface, and 
 conducting one or more silicon oxide deposition cycles comprising alternately and sequentially contacting the substrate with a metal catalyst and a silanol. 
 
     
     
       14. The method of  claim 13 , additionally comprising contacting the dielectric surface with a silylating agent prior to selectively forming the polymer passivation layer on the metal surface. 
     
     
       15. The method of  claim 14 , wherein the silylating agent comprises alyltrimethylsilane (TMS-A), chlorotrimethylsilane (TMS-Cl), N-(trimethylsilyl)imidazole (TMS-Im), octadecyltrichlorosilane (ODTCS), hexamethyldisilazane (HMDS), or N-(trimethylsilyl)dimethylamine (TMSDMA). 
     
     
       16. The method of  claim 13 , wherein the metal catalyst comprises trimethyl aluminum (TMA), dimethylaluminumchloride, aluminum trichloride (AlCl 3 ), dimethylaluminum isopropoxide (DMAI), tris(tert-butyl)aluminum (TTBA), tris(isopropoxide)aluminum (TIPA) or triethyl aluminum (TEA). 
     
     
       17. The method of  claim 13 , wherein the silanol is tris(tert-pentoxy)silanol (TPS). 
     
     
       18. The method of  claim 13 , wherein the silicon oxide deposition cycle is repeated two or more times in a row. 
     
     
       19. The method of  claim 13 , wherein the substrate is contacted with the silanol two or more times in at least one silicon oxide deposition cycle. 
     
     
       20. The method of  claim 13 , wherein the polymer passivation layer comprises a polyimide layer or a thiol SAM.